摘要
秦巴北部的商县-卢氏县地区广泛分布有区域变质的方解石-白云石共生矿物对,它们对于估计变质作用和断裂构造作用的温压条件,有着重要的意义。本文着重就该地区Fe^(2+)在方解石-白云石中的X_(Fe)^(Co)>X_(Fe)^(Dol)分配情况,提出新的计压方法。
A regionally metamorphic calcite-dolomite Fe-Mg exchange geobarometerhas been calibrated using the data on coexisting calcite-dolomite which is pro-vided with model X_(Fe)^(Cc)>X_(Fe)^(Dol) in the Shangxian-Lushi area of southeasternQinling. The geobarometric equation of model X_(Fe)^(Cc)>X_(Fe)^(Dol) is: P(MPa)=508. 12+257.69 lg(X_(Fe)^(Cc)/X_(Fe)^(Dol)). This geobarometer is more satisfactory than theprevious calcite-dolomite geobarometer. The typomorphic feature of the calc-ite-dolomite pair from the fault zone in this area is X_(Fe)^(Cc)>X_(Fe)^(Dol).
出处
《矿物学报》
CAS
CSCD
北大核心
1989年第1期71-75,共5页
Acta Mineralogica Sinica
关键词
方解石
白云石
地质压力计
秦岭
mineral geobarometer
calcite
dolomite
regional metamorphism
southeastern China Qinling
